diff --git a/obfuscator/diff-liveness.py b/obfuscator/diff-liveness.py
new file mode 100644
index 0000000..5e4fac9
--- /dev/null
+++ b/obfuscator/diff-liveness.py
@@ -0,0 +1,45 @@
+import json
+import argparse
+
+def liveness_eq(title: str, a: dict[str, list[str]], b: dict[str, list[str]]) -> bool:
+    aflags = set(a["flags"])
+    bflags = set(b["flags"])
+    if aflags != bflags:
+        print(f"{title} flags differ")
+        print(f"  A: {sorted(aflags)}")
+        print(f"  B: {sorted(bflags)}")
+    aregs = set(a["regs"])
+    bregs = set(b["regs"])
+    if aregs != bregs:
+        print(f"{title} regs differ")
+        print(f"  A: {sorted(aregs)}")
+        print(f"  B: {sorted(bregs)}")
+    return True
+
+def main():
+    parser = argparse.ArgumentParser(description="Diff liveness")
+    parser.add_argument("A", type=str, help="Old liveness")
+    parser.add_argument("B", type=str, help="New liveness")
+    args = parser.parse_args()
+
+    old = json.load(open(args.A))
+    new = json.load(open(args.B))
+
+    for block_addr in old:
+        if block_addr not in new:
+            print(f"Block {block_addr} not found in new")
+            continue
+        old_block = old[block_addr]
+        new_block = new[block_addr]
+        liveness_eq(f"Block {block_addr} liveness in", old_block["Liveness in"], new_block["Liveness in"])
+        liveness_eq(f"Block {block_addr} liveness out", old_block["Liveness out"], new_block["Liveness out"])
+        for instr_addr in old_block["Instr Liveness"]:
+            if instr_addr not in new_block["Instr Liveness"]:
+                print(f"Instr {instr_addr} not found in new")
+                continue
+            old_instr = old_block["Instr Liveness"][instr_addr]
+            new_instr = new_block["Instr Liveness"][instr_addr]
+            liveness_eq(f"Block {block_addr} -> {instr_addr}", old_instr, new_instr)
+
+if __name__ == "__main__":
+    main()